I snapped these on Friday when this truck was fueling up to head north.
Jack says they are used for crude oil and that they lay on their sides, not upright like on the truck. You can see the actual metal portion of the pipe that is colored green with anti-corrosion paint. The black is thinner metal and in between the two is foam insulation.
This load is obviously going to Deadhorse or Prudhoe Bay. (FYI: Deadhorse refers to the “town” where companies have their operations, and Prudhoe Bay refers to the actual oil fields and is a much larger area.)
Click on the photos for larger images.